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首页> 外文期刊>Ecological Applications >EFFECTS OF SELECTIVE SEED PREDATION BY RODENTS ON SHORTGRASS ESTABLISHMENT
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EFFECTS OF SELECTIVE SEED PREDATION BY RODENTS ON SHORTGRASS ESTABLISHMENT

机译：杂草选择性播种对矮生植物建立的影响

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Our experiment tested whether selective seed predation by rodents affects the establishment of blue grama (Bouteloua gracilis) and buffalo grass (Buchloe dactyloides) at a disturbed site in the Colorado shortgrass steppe. We hypothesized that foraging rodent granivores respond positively to large seed sizes and to high seed densities, and we predicted that intensive foraging would constrain grass establishment. Capture-recapture studies confirmed that heteromyid granivores, kangaroo rats (Dipodomys ordii) and hispid pocket mice (Perognathus hispidus), comprised 48% of the local rodent community. Seeds of blue grama and buffalo grass were shallowly planted at three densities in replicated plots within and outside rodent exclosures. The frequency of digging in seeded rows (seed predation) and the frequency of herbivory on seedlings were calculated. We assessed grass establishment using seedling frequency and harvested aboveground biomass. Seed foraging was related positively to seed size, but foraging responses to seed densities were not confirmed. Herbivory on seedlings was not intensive and was similar between the two grasses. Seedling frequency and harvested biomass numbers for the species with the larger seeds, buffalo grass, were reduced more in rodent-accessible plots than were values for blue grama. Rodent seed predation can constrain the establishment of large-seeded species, but results should be interpreted to reflect site-specific conditions and the characteristics of seeded species. [References: 37]
机译：我们的实验测试了啮齿动物对种子的选择性捕食是否会影响科罗拉多短草草原中受干扰地点的蓝色格拉玛（Bouteloua gracilis）和水牛草（Buchloe dactyloides）的形成。我们假设啮齿动物食草动物的觅食对大种子尺寸和高种子密度具有积极的反应，并且我们预测密集的觅食会限制草的生长。捕获-捕获研究证实，异鼠类食肉动物，袋鼠大鼠（Dipodomys ordii）和小袋鼠（Perognathus hispidus）占当地啮齿动物群落的48％。在啮齿类动物排泄物内部和外部的重复样地中，以三种密度浅种植了蓝色格拉玛和水牛草的种子。计算了在种子行中挖掘的频率（种子捕食）和在草上觅食的频率。我们使用幼苗频率评估了草的建立并收获了地上生物量。种子觅食与种子大小呈正相关，但未确认觅食对种子密度的反应。幼苗上的草食性不高，在两种草之间相似。在具有啮齿动物的地块中，具有较大种子的水牛草的幼苗的发生频率和收获的生物量数量比蓝色格拉玛值减少的更多。啮齿类动物的种子捕食可以限制大种子物种的建立，但结果应解释为反映特定地点的条件和种子物种的特征。 [参考：37]

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